Bloomberg visited the Capitol last week seeking to defend the financial industry. But in the process, he wound up sitting in on a GOP gripe session about New York Democrats — and, sources say, chimed in to criticize Schumer for turning against a hometown industry that has fueled both men’s careers.

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Relations between the billionaire mayor and the state’s senior senator — and its sole remaining Democratic powerbroker — have curdled in the heat of policy disagreements and Schumer’s backing of Kirsten Gillibrand for Hillary Clinton’s old Senate seat.

Bloomberg had previously criticized the city’s congressional delegation in generic terms for backing stringent regulation of banks and giant hedge funds, arguing that it would cripple the city’s most vital industry. But the third-term mayor has become increasingly disillusioned with Schumer in recent days, sources say, singling out the Brooklyn Democrat in recent meetings with business leaders and politicians.

In an April 12 meeting in Senate Minority Leader Mitch McConnell’s spacious office overlooking the National Mall, Bloomberg said that Schumer has been “AWOL,” that “this is a real problem for New York City” and that “our senators who are normally in the middle of it aren’t there,” according to a Republican senator briefed on the meeting.

Another person familiar with the meeting said Bloomberg was simply agreeing with criticism of Schumer leveled by McConnell and didn’t lash out pre-emptively: “They said that Chuck was not doing anything, that he was very unhelpful, that he wasn’t providing the ballast for New York,” the source said, adding, “Bloomberg didn’t disagree.”

McConnell’s office declined to comment other than to confirm that the meeting took place. Bloomberg's office also declined comment, but a person close to the mayor downplayed the conflict, saying, "Their relationship is fundamentally strong."

Schumer, whose wife once served as Bloomberg’s transportation commissioner, is reportedly miffed that the socially liberal, economically moderate independent hasn’t aired his gripes personally during their regular one-on-one phone conversations.

“The mayor’s jihad against [President Barack] Obama and Schumer and the Dodd bill [is] a curious strategy,” said a person close to Schumer. “When you come down to Washington and argue for next to no regulation, it puts New York in the cross hairs more, not less.”

The issue of regulating Wall Street is arguably the stickiest of Schumer’s career — forcing him to choose between an industry that has pumped more than $10 million into his campaigns and the political survival instincts that have made him one of the party’s canniest strategists.